CN101809336B - Cvt control system having variable power source speed - Google Patents

Cvt control system having variable power source speed Download PDF

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Publication number
CN101809336B
CN101809336B CN2008801088012A CN200880108801A CN101809336B CN 101809336 B CN101809336 B CN 101809336B CN 2008801088012 A CN2008801088012 A CN 2008801088012A CN 200880108801 A CN200880108801 A CN 200880108801A CN 101809336 B CN101809336 B CN 101809336B
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China
Prior art keywords
speed
power source
velocity
limit value
controller
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CN2008801088012A
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CN101809336A (en
Inventor
M·C·休巴德
B·D·霍夫
M·E·雷蒂格
S·J·朱里卡克
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Caterpillar Inc
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Caterpillar Inc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
    • B60W10/101—Infinitely variable gearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
    • B60W30/18—Propelling the vehicle
    • B60W30/188—Controlling power parameters of the driveline, e.g. determining the required power
    • B60W30/1882—Controlling power parameters of the driveline, e.g. determining the required power characterised by the working point of the engine, e.g. by using engine output chart
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/46—Automatic regulation in accordance with output requirements
    • F16H61/465—Automatic regulation in accordance with output requirements for achieving a target input speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/46—Automatic regulation in accordance with output requirements
    • F16H61/47—Automatic regulation in accordance with output requirements for achieving a target output speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B60W2710/0644—Engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
    • F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
    • F16H37/06—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
    • F16H37/08—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing
    • F16H37/0833—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths
    • F16H37/084—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths at least one power path being a continuously variable transmission, i.e. CVT
    • F16H2037/088—Power split variators with summing differentials, with the input of the CVT connected or connectable to the input shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
    • F16H47/02—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type
    • F16H47/04—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type the mechanical gearing being of the type with members having orbital motion

Abstract

A powertrain control system (21) is disclosed. The powertrain control system may have a power source (24) and a CVT (26) coupled to an output (30) of the power source. The powertrain control system may further have a controller (48) in communication with the power source and the CVT. The controller may have a map (58) with a plurality of speed modes, and, for at least one of the plurality of speed modes, the controller may be configured to vary an actual power source speed based on at least one of a CVT output speed or a ground speed.

Description

Stepless speed variator control system with variable power source speed
Technical field
The present invention relates in general to a kind of control system be used to the machine with stepless speed variator, and more particularly, relates to a kind of for the control system that changes power source speed based on the stepless speed variator output speed.
Background technique
Can use such as on-highway vehicle, non-highway and carry out multiple-task with the machine of the heavy-duty machine of haul truck, wheel loader, motor grader and other types.These machines generally comprise power source, finish the work so that the power that needs to be provided thereby power source can be presented as such as the motor of diesel engine, petrol engine or gaseous propellant engine.The power that power source produces can be passed to one or more ground engagement device with propel machine by the speed changer such as stepless speed variator (CVT).
Usually use control system of machine to coordinate and regulate the operation of power source and CVT to improve responsiveness and the efficient of machine.For example, when machine is advanced, power source and CVT can have make power source and CVT is basicly stable and efficiently the operation rotating speed and torque range.Operation outside this scope may increase fuel consumption and/or reduce responsiveness.
Authorize U.S. Patent No. 7,192,374 (' 374 patents give people such as Kuras on March 20th, 2007) in a kind of method for control power source and CVT is disclosed.' 374 patent disclosure a kind of adjusting velocity ratio make motor under the optimum speed situation (namely in the speed range that motor moves most effectively) operation the drop engine speed control system.The control system of ' 374 patent discloses a kind of operator's input end that input signal is provided to controller.Operator's input end can be accelerator pedal for example, and it makes the operator can depress pedal improves machine with request output speed.Input signal can be represented the rotating speed of asking, and controller changes it into motor rotary speed instruction (motor is the assembly of CVT, is driven by motor) then.The control system of ' 374 patent prevents that the motor rotary speed instruction from surpassing the rotating speed upper limit and being lower than the rotating speed lower limit with dropping to.Calculate these limit values and make that needing only the motor rotary speed instruction remains between the rotating speed upper and lower bound, the motor torque instruction will remain in the torque capacity scope of motor.Motor torque limit value under the particular motor rotating speed can be determined by the torque/speed curves of motor.When engine loading too high (for example engine speed drop to be lower than threshold value), engine retard control algorithm (being carried out by controller) also will reduce motor rotary speed and instruct.Thus ' method of 374 patents makes CVT can quickly respond in the variation of motor rotary speed instruction in the damage that prevents motor and speed changer.
Though the machine of ' 374 patent can help motor to keep responsiveness when preventing the potential injury of motor and speed changer, it can not provide operation efficiently and the control of motor under all situations.By only controlling motor rotary speed, the control system of ' 374 patent may allow motor to move with inefficient and/or unresponsive engine speed (namely crossing low or too high engine speed) under current transmission gear shift ratio, work final controlling element situation and load state.
Disclosed machine system is intended to overcome above-mentioned one or more shortcomings.
Summary of the invention
In one aspect, the present invention is directed to a kind of power transmission control system.The power transmission control system can comprise power source and be attached to the CVT of the output terminal of power source.The power transmission control system can comprise and power source and CVT controller in communication further.Controller can comprise the Parameter Map with a plurality of velocity modes, and in a plurality of velocity modes at least one, and controller can change power source actual speed based in CVT output speed or the ground speed at least one.
In yet another aspect, the present invention is directed to a kind of apparatus control method.This method can comprise producing rotation output and guiding rotates output to drive CVT.This method can comprise the output speed of measuring CVT and the actual speed that changes rotation output based on measured CVT output speed further.Carry out when changing at least one that actual speed can be in carrying out a plurality of velocity modes.
Description of drawings
Fig. 1 is a kind of schematic representation of exemplary disclosed machine;
Fig. 2 can be used in the exemplary disclosed Power Train of machine shown in Figure 1 and the schematic representation of control system; And
Fig. 3 is the exemplary parameter figure that is used for the Power Train of control graph 2.
Embodiment
Fig. 1 shows a kind of exemplary machine 10.Machine 10 can be moving vehicle, and it carries out some types of the operation that is associated with industry or any other industry known in the art such as mining industry, building industry, agricultural, transport service.For example, machine 10 can be the muck haulage machine, for example wheel loader, excavator, backhoe, motor grader or the muck haulage machine that any other is fit to known in the art.Alternatively, machine 10 can be that machine is carried out in load-carrying vehicle, boats and ships, passenger vehicle or any other operation that is fit to.Machine 10 can comprise one or more traction gears 12, work final controlling element 16, operator station 18 and Power Train 20.
Traction gear 12 can comprise the one or more wheels that can allow machine 10 to move that are positioned at vehicle 10 each side (side only is shown).Alternatively, traction gear 12 can comprise crawler belt, driving belt or other traction gears known in the art.Arbitrarily traction gear 12 can be driven and/or can be turned to.
Work final controlling element 16 can comprise for any device of carrying out particular task, for example scraper bowl, perching knife, scoop, rake, hammer, grab bucket or any other task execution device known in the art.One or more work final controlling element 16 can be connected to machine 10 and can be controlled by operator station 18.Work final controlling element 16 can be connected to machine 10 by direct pivot or linked system, and can activate by one or more hydraulic actuators, electric motor or in any other mode that is fit to.Work final controlling element 16 can be with any way known in the art with respect to machine 10 pivots, rotation, slip, swing, lifting or movement.
Operator station 18 can be the position that the operator controls machine 10.Operator station 18 can be positioned at or not be positioned on the machine 10, and can comprise operator's input device 22 (see figure 2)s for one or more assemblies of control Power Train 20.Operator's input device 22 can be positioned near the operator's seat place and can use single shaft or multiaxis controlling rod, steering wheel, handle, push-and-pull device, button, pedal or any other input device known in the art.Can expect that operator station 18 can comprise extra operator's input device, for example the steering gear, braking device, gear ratio selection device and/or other operator's input devices known in the art.
As shown in Figure 2, Power Train 20 can comprise that co-operation is to promote the assembly of machine 10.Specifically, Power Train 20 can comprise the power source 24 that is connected to stepless speed variator (CVT) 26 drivingly.Can expect that Power Train 20 also can comprise the torque-converters (not shown) that connects power source 24 and CVT26.
Power source 24 can be provided for the power output (see figure 1) of machine 10 runnings.Power source 24 can use explosive motor, for example the explosive motor of diesel engine, petrol engine, gaseous propellant engine (for example natural gas engine) or any other type known in the art.Power source 24 can alternatively use non-combustion power source, for example is attached to fuel cell or the power storage devices of electric motor.Power source 24 can provide rotation output with driving traction gear 12 (see figure 1)s, thus propel machine 10.Power source 24 also can provide rotation output to provide power to the oil hydraulic circuit 25 that is used for actuating work final controlling element 16.
CVT 26 can comprise a plurality of sub-components (or kinetic current path) that rotating power are passed to traction gear 12 from the output terminal 30 of power source 24.These sub-components can comprise for example mechanical transmission 27 and hydrostatic transmission 28.Can expect that mechanical transmission 27 and hydrostatic transmission 28 can collateral action (as shown in Figure 2) or serial effects.
The mechanical transmission 27 of CVT 26 can use the two-way mechanical transmission of many speed that for example has a plurality of forward gears gear ratio, one or more reverse gear gear ratio and one or more clutch (not shown).Mechanical transmission 27 can optionally activate clutch so that the gear (not shown) meshes to produce discrete output variable speed ratio with predetermined combinations.Mechanical transmission 27 can be automatic transmission, and wherein gearshift is based on the maximum gear ratio that power source speed, operator select and is stored in that gearshift Parameter Map in the controller carries out.Alternatively, mechanical transmission 27 can be manual transmission, and wherein meshed gears is manually selected by the operator.
Hydrostatic transmission 28 can comprise by first fluid path 42 and second fluid passage, 44 interconnected pump 38 and motors 40.Pump 38 for example can use variable delivery pump that the output terminal 30 by power source 24 rotates so that fluid pressurized.Pump 38 can guide to motor 40 by fluid passage 42 or 44 with charging fluid, thereby motor 40 is rotated subsequently.Can change " gear ratio " or " effectively gear ratio " of hydrostatic transmission 28 by the discharge capacity that changes pump 38.Can expect that in the running restriction of pump 38, the fluid displacement of pump 38 can ad infinitum change (namely can realize any fluid displacement in the running restriction of pump 38), thereby form effective gear ratio of unlimited amount.Hydrostatic transmission 28 can alternatively use electrically variable transmission, based on the stepless speed variator of roller or based on the stepless speed variator of pulley.
Can use one or more gear assemblies 32 (only illustrating among Fig. 2) of being arranged between mechanical transmission 27, hydrostatic transmission 28 and the mechanical output terminal 36 with the output combination of mechanical transmission 27 and hydrostatic transmission 28.Gear assembly 32 can comprise for example planetary gear set.Each gear assembly 32 can have for example gear carrier 33, gear ring 35 and sun gear 37.Sun gear 37 can be connected to mechanical output terminal 36, and mechanical output terminal 36 connects with traction gear 12.Mechanical transmission 27 can be connected to gear carrier 33 and hydrostatic transmission can be connected to gear ring 35.Can expect, by hydrostatic transmission or mechanical transmission 27 being placed on the outlet side (namely linking with mechanical output terminal 36) of gear assembly 32 and then a paths of output terminal 30 (for example being connected directly to gear assembly 32, if mechanical transmission 27 is positioned at the output terminal of gear assembly 32, one paths of output terminal 30 can be connected to gear carrier 33), can alternatively form similar configuration.
Can recently realize making up gear ratio by changing the discrete gear ratio of mechanical transmission 27 and effective speed change of hydrostatic transmission 28, thereby change input, output torque and the rotary speed property of CVT 26.For example, gear ring 35 rotating speed that can determine sun gear 37 with respect to the rotating speed of gear ring 35 rotations with respect to rotating speed and the gear carrier 33 of ground rotation.
Control system 21 can monitor and revise the performance of machine 10 and assembly thereof.Especially, control system 21 can comprise velocity transducer 46 and controller 48.Controller 48 can be communicated by letter with velocity transducer 46 by communication line 50, communicates by letter with power source 24 by communication line 52, communicates by letter with CVT 26 by communication line 54, and communicates by letter with operator's input device 22 by communication line 56.Can expect, controller 48 also can with other component communication (not shown) of oil hydraulic circuit 25 and/or machine 10.
Velocity transducer 46 can be positioned to the rotating speed (being the CVT output speed) of sensing machinery output terminal 36.Velocity transducer 46 can use for example magnetic pick-up sensor, rotating coder, tachometer maybe can produce the sensor of any other type of corresponding signal.Velocity transducer 46 can be arranged on the axle that is associated with mechanical output terminal 36 near, perhaps near any other assembly (for example wheel shaft, wheel or gear) of the machine 10 that is associated with the CVT output speed of rotating speed.
Controller 48 can use single microprocessor or a plurality of microprocessor, and it comprises the device for the operation of control machine 10.The microprocessor that multiple market can be bought can be configured to the function of implementation controller 48, and should be appreciated that controller 48 can easily use the general-purpose machinery microprocessor that can control multiple machine function.Any other assembly that controller 48 can comprise storage, auxilary unit, processor and be used for running application.Multiple other circuit can be associated with controller 48, for example the circuit of power supply circuits, circuit for signal conditioning, data acquisition circuit, signal output apparatus, signal amplification circuit and other types known in the art.
Controller 48 can comprise the one or more Parameter Map in the internal storage that is stored in controller 48.Each of these Parameter Map all can comprise the File of form, chart and/or equation form.As shown in Figure 3, controller 48 can comprise and can be used in control (CVT output speed and machine ground speed all can use the signal that receives from velocity transducer 46 to measure or calculate as CVT output speed and/or machine ground speed, and the CVT output speed can easily be converted to the machine ground speed, and vice versa) at least one parameter Figure 58 of power source speed limit value (being the maximum (top) speed of power source rotation output) of function.Can expect that actual (or current) power source speed can be lower than the power source speed limit value, but cannot be higher than the power source speed limit value.Parameter Figure 58 can be given for the power source speed limit value such as a plurality of velocity modes of low-speed mode 60, middle fast mode 62 and fast mode 64.Velocity mode can be directly related with machine ground speed and/or CVT output speed.For example, low-speed mode 60, middle fast mode 62 and high-speed pattern 64 can be relevant to about 0-8,8-25 and 19-40 kilometer ground speed hourly (velocity mode also can with the formal representation of CVT output speed) respectively.Can expect, when for example using low-speed mode 60 or middle fast mode 62, controller 48 can allow to regulate the power source actual speed high to but be no more than the power source speed limit value.Can expect further that at least a velocity mode such as fast mode 64, controller 48 can be based on CVT output speed control power source actual speed (or power source speed instruction).For example, controller 48 can provide the engine speed instruction the power source actual speed is forced to be restricted to power source speed limit value (operator does not re-use directly control power source actual speed of operator's input device 22).Therefore, in fast mode 64, operator's input device 22 can be controlled the output torque of CVT 26.Can expect, can optimize each velocity range so that the efficient of machine 10 and responsiveness maximization.
When the machine ground speed was about 0kph, the power source speed limit value can be set to maximum power source speed, for example about 1700rpm of demarcating in low-speed mode 60 neutralizations.Under the machine ground speed of 0kph, make the maximization of power source speed limit value can be provided in the potentiality that increase flow of hydraulic fluid in the oil hydraulic circuit 25.In low-speed mode 60, the trend of power source speed limit value can roughly descend along with the increase of machine ground speed, reaches about 1600rpm when the ground speed at 8kph.If the power source actual speed is followed the power source speed limit value, can expect that controller 48 can pass through to change effective gear ratio of hydrostatic transmission 28 to increase the machine gait of march when reducing power source actual speed (for single discrete gear ratio).For example, if the operator activates operator's input device 22 (for example depressing pedal fully) fully, cause the power source actual speed to follow the power source speed limit value thus, controller 48 can by with change than the rotating speed of gear carrier 33 faster rate change the rotating speed (by pump 38) of gear ring 35 thus reduce power source speed simultaneously increasing the machine gait of march.Controller 48 can be independent of current selected discrete gear ratio and effective gear ratio of regulating hydrostatic transmission 28 continuously, forming the combination in any gear ratio, thereby realize specific power source speed track (for example increase as the function of machine ground speed, minimizing or constant power source speed) or realize other expectant control target (for example specific propelling force, specific torque, specific fuel efficiency and/or be used for the specific power of work final controlling element operation) of controller 48.
At middle fast mode 62, the power source speed limit value can be set to substantially invariable level, for example about 1600rpm.The power source speed limit value of 1600rpm can help to realize single function operation final controlling element cycle time.The machine gait of march of controller 48 when therefrom fast mode 62 switches to fast mode 64 (switching thus) between the employed power source speed limit value of friction speed pattern can depend on the degrees of actuation (for example volume under pressure of pedal) of acceleration and/or operator's input device of machine 10.Can expect, can be by the mode computing machine acceleration that velocity transducer is measured or other is fit to.
For example, when machine 10 just slightly accelerates and/or a spot of operator's input device when activating, controller 48 can be under lower machine ground speed (for example about 19kph) therefrom fast mode 62 switch to fast mode 64.Alternatively, when machine 10 is just carrying out big acceleration and/or a large amount of operator's input device when activating, controller 48 can be under higher machine ground speed (for example about 25kph) therefrom fast mode 62 switch to fast mode 64.Therefrom the power source speed limit value of fast mode 62 makes it possible to increase fuel efficiency and machine propelling force under big accelerated condition to this delay of the switching of the power source speed limit value of fast mode 64.The power source speed limit value of the part (for example part of about 19-25kph) of fast mode 62 can increase to the about 1700rpm at 25kph from the about 1600rpm at 19kph in big accelerated condition is employed.
Fast mode 64 times (for example about 19-25kph part), when machine 10 just slightly accelerates and/or operator's input device in a small amount when activating, the power source actual speed can be set to substantially invariable level, for example about 1300rpm.In the higher speed part (for example part of about 25-40kph) of fast mode 64, the function that the power source speed limit value can be used as ground speed increases.The power source speed limit value can have the track of increase with the loss of the characteristic of compensation CVT 26, and its function that can be used as the machine ground speed increases.Can expect that the power source speed limit value can increase to and be about 1700rpm when 40kph.Can expect further that the power source speed limit value can continue with same rate increase when being higher than the speed of 40kph, perhaps alternatively can remain unchanged at the 1700rpm place.The power source speed limit value may be substantially of linear in all increases of low-speed mode 60, middle fast mode 62 and fast mode 64 and/or decline, perhaps limited by any other track that is fit to.
Each velocity range can be relevant to a discrete gear ratio of mechanical transmission 27 among parameter Figure 58.For example, low-speed mode 60 can be relevant to the first discrete gear ratio, and middle fast mode 62 can be relevant to the second discrete gear ratio, and fast mode 64 can be relevant to the 3rd discrete gear ratio.Can expect that controller 48 can be based on switching between machine gait of march, current selected discrete gear ratio or the two a plurality of velocity mode in parameter Figure 58.
Industrial applicibility
Disclosed control system needing to go for any machine of power source control.Disclosed control system can be revised the power source speed limit value as the ground speed function, thereby makes the maximized fuel consumption that reduces simultaneously of machine propelling force.The operation of control system 21 will be described below.
In a kind of example, the operator of machine 10 can activate operator's input device 22, thereby requires machine to move.Operator's input device 22 can require the operator to be sent to controller 48 by communication line 56, and controller 48 can be converted to this signal desired power source speed and power source torque.Then, controller 48 can be found desired power source speed in parameter Figure 58, is no more than the power source speed limit value to guarantee desired power source speed.Controller 48 can be set to the power source actual speed desired power source speed, up to reaching but can not surpass the power source speed limit value of low-speed mode 60.
In machine operation, controller 48 can communicate by letter to determine machine ground speed and/or CVT output speed continuously with velocity transducer 46.When the machine ground speed reaches about 8kph, the power source speed limit value of fast mode 62 controller 48 can switch to from the power source speed limit value of low-speed mode 60.From low-speed mode 60 in the transformation of fast mode 62, controller 48 also can send instruction and switch to the second discrete gear ratio from the first discrete gear ratio.
In commission fast mode 62 time, the operator can continue freely to regulate the power source actual speed, up to but can not surpass the power source speed limit value.When the machine ground speed reached about 19kph, controller 48 can be communicated by letter with velocity transducer 46.Whether controller 48 can use from the information of velocity transducer 46 and accelerate with definite machine 10.Controller 48 also can be communicated by letter with operator's input device 22 with the degree of determining that operator's input device activates.If machine 10 surpasses acceleration rate threshold and/or operator's input device 22 surpasses actuating amount threshold value, the power source speed limit value of fast mode 62 during controller 48 can continue to use is until reaching higher machine ground speed, for example 25kph.Alternatively, if machine 10 is lower than acceleration rate threshold and/or operator's input device 22 is lower than actuating amount threshold value, controller 48 can switch to the power source speed limit value of fast mode 64 at about 19kph.Can expect that in the transformation of fast mode 64, controller 48 also can send instruction and switch to the 3rd discrete gear ratio from the second discrete gear ratio at fast mode 62 therefrom.
When carrying out fast mode 64, controller 48 can be forced the power source actual speed to be restricted to the power source speed limit value, makes operator's input device 22 only can control the output torque of CVT 26.But, can expect that whole power source speed limit value curve can be according to the load that machine 10 bore or stood rise in proportion or descend (entire curve that for example, represents the power source speed limit value of fast mode 64 among Fig. 3 can rise or descend).For example, machine loading increases (for example because the work of use final controlling element 16 cause) and can cause whole power source speed limit value curve to rise in proportion, and load reduces to cause whole power source speed limit value curve to descend in proportion.Controller 48 can remain on fast mode 64 and drop to the ground speed scope that is associated with middle fast mode 62 or low-speed mode 60 until the machine ground speed.
Disclosed control system can realize several advantages.Especially, control the power source actual speed to allow to increase the flow of the pump that is associated with the work final controlling element by allowing the operator at lower ground speed, disclosed control system can increase productivity and responsiveness.But, the power source actual speed can be forced to be restricted to the power source speed limit value to guarantee maximum efficient and propelling force at higher speed controller.In addition, the power source speed limit value can be used as the function of machine ground speed or CVT output speed, thereby adapts to the specific performance losses of power source and CVT combination.
Those skilled in the art will be very clear, without departing from the present invention, can carry out multiple correction and modification to disclosed control system.Consider the practice of specification disclosed herein and control system, those skilled in the art will know other mode of executions of control system very much.For example, can use any alternative CVT to replace disclosed CVT, and all velocity ranges can be relevant to actual discrete gear ratio.Specification and example only are intended to as being exemplary, and real scope is represented by claims and equivalent thereof.

Claims (7)

1. a power transmission control system (21):
Itself and power source (24) and
Stepless speed variator (26) joins, and the output terminal of this stepless speed variator and described power source (30) links; This power transmission control system comprises:
Controller (48), it is communicated by letter with described stepless speed variator with described power source, and wherein said controller comprises the Parameter Map (58) with a plurality of velocity modes,
Described a plurality of velocity mode comprises at least one first velocity mode and a second speed pattern, and this controller can be transformed into the second speed pattern with first velocity mode owing to ground speed surpasses first threshold speed,
Described Parameter Map comprises the power source speed limit value for described a plurality of velocity modes, and wherein the power source speed limit value of first velocity mode is as the function for the ground speed of constant machine loading,
Power source speed limit value for first velocity mode of constant machine loading has:
In first value of zero ground speed, and
In second value greater than zero ground speed, wherein first value is worth greater than second,
Wherein at first velocity mode, controller can allow to regulate actual power source speed height extremely by operator's input device but be no more than the power source speed limit value.
2. power transmission control system as claimed in claim 1, wherein, described a plurality of velocity mode comprises the third speed pattern (64) with power source speed limit value, and the power source speed limit value that is used for described third speed pattern increases as the function of the ground speed that increases under the constant machine load, and the power source speed limit value of second speed pattern remains unchanged as the function of the ground speed that increases under the constant machine load.
3. power transmission control system as claimed in claim 2, wherein, when described controller was carried out described third speed pattern, described controller can be directly changes the power source actual speed as the function of ground speed.
4. power transmission control system as claimed in claim 3, described operator's input device can be worked as the output torque of controlling described stepless speed variator when described controller is carried out described third speed pattern.
5. power transmission control system as claimed in claim 1, wherein said controller can make the second speed pattern switch to the third speed pattern owing to ground speed surpasses second threshold velocity, and wherein said controller can be set at second threshold velocity a lower threshold velocity or the higher threshold velocity as the function of at least one machine acceleration or operator's input device degrees of actuation.
6. power transmission control system as claimed in claim 1, wherein, described stepless speed variator also comprises the mechanical transmission (27) with hydrostatic transmission (28) parallel operation, and described mechanical transmission has a plurality of discrete gear ratio, and one in each of described a plurality of discrete gear ratio and the described a plurality of velocity modes is associated.
7. apparatus control method comprises:
Produce rotation output;
Guide described rotation output, to drive stepless speed variator (26);
Measure the stepless speed variator output speed;
Wherein, change actual speed during in carrying out a plurality of velocity modes at least one, wherein a plurality of velocity modes comprise at least one first velocity mode and a second speed pattern, because ground speed surpasses a threshold velocity and first velocity mode is transformed into the second speed pattern
Be provided with the power source speed limit value for described a plurality of velocity modes, wherein the power source speed limit value of first velocity mode is as the function for the ground speed of constant machine loading,
Power source speed limit value for first velocity mode of constant machine loading has:
In first value of zero ground speed, and
In second value greater than zero ground speed, wherein first value is worth greater than second,
Wherein at first velocity mode, permission is regulated actual power source speed height extremely but is no more than the power source speed limit value.
CN2008801088012A 2007-09-28 2008-09-26 Cvt control system having variable power source speed Active CN101809336B (en)

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